- Preparation Tools: Digital multimeter (accuracy ≥ 0.1%, supporting English display), small flat-blade screwdriver (insulated material, complying with overseas safety standards), 200kg standard weight (verified by metrology, complying with OIML standards), level (accuracy ≤ 0.02mm/m), marker pen.
- Detailed Adjustment Steps:
- Step 1: Basic Inspection: Use a level to confirm whether the weighbridge body is horizontal. If it is not horizontal, adjust the foundation anchor bolts first to ensure that the horizontal error of the weighbridge body is ≤ 2mm; remove foreign objects (stones, soil) under and around the weighbridge body to avoid affecting weighing; for overseas sites with sand and wind, the cleaning frequency should be increased.
- Step 2: Loading Test: Place the 200kg standard weight on the four corners (10cm from the edge) and the center of the weighbridge body in sequence, record the weighing values at each point (recorded as W1, W2, W3, W4, Wcenter), and calculate the error with the standard weight (error = (weighing value - 200)/200×100%); the error should be controlled within ≤ 0.1%, otherwise adjustment is required.
- Step 3: Open the Junction Box: Disconnect the weighbridge power supply, open the junction box cover (pay attention to waterproofing, and check whether the sealant is intact in rainy overseas areas), and find the sensor terminal blocks (usually marked with numbers 1-4, with clear English marks) and potentiometers (one potentiometer corresponding to each sensor) at the four corners.
- Step 4: Adjust the Potentiometer:
- If the weighing value at a certain corner is low (such as W1=198kg), slowly rotate the corresponding potentiometer clockwise (about 1/4 turn), perform a power-on test, and repeat until the error is ≤ 0.1%;
- If the weighing value at a certain corner is high (such as W2=202kg), slowly rotate the corresponding potentiometer counterclockwise, and adjust similarly;
- Do not rotate too much each time during adjustment to avoid excessive errors; after adjustment, re-test the corner and adjacent corners to prevent mutual influence; overseas customers can connect with WEIGHT WORTH engineers via video to obtain real-time guidance.
- Step 5: Confirmation and Fixing: After adjusting all corner points, place the weight in the center position, confirm that the weighing value is 200kg±0.2kg; close the junction box cover, and perform waterproof sealing (apply sealant complying with overseas standards, such as silicone sealant) to prevent rainwater and dust from entering.
- Professional Support: If the error is still large after self-adjustment, or you are not familiar with the structure of the junction box, you can call WEIGHT WORTH at 15863457610, and engineers will provide remote video guidance (supporting English communication)
